If you have ever tried to delete a folder or rename a file only to be greeted by an error message informing you that the file is in use - even though it does not appear to be the case - Unlocker may just be the tool you have been looking for.

This free utility adds a new entry to the context menu that appears when you right click a file or folder, and this will reveal which of Windows' process are currently use the item you are trying to edit. You then have the option of terminating the process in question or using the Unlock option to try to free up the file or folder automatically.

There is no need to restart Windows, so in just a few clicks you can overcome the obstacle that was preventing you from continuing with the action you wanted to perform. It really is that simple, and it is hard to appreciate just how useful it is until you try it out. This may not be a program you use every day of the week, but it is very useful to have installed just in case.

Please note, though, you need to be very sure that a file is safe to be deleted before using Unlocker. Delete something important and you could crash an application, your entire PC, maybe even damage Windows: use the program with extreme caution.

Verdict:

Unlocker is a handy way to bypass the "file in use" errors you might see sometimes, but beware - use it to delete the wrong file and you could seriously damage your PC

I've been using this one for 2 years and it comes in handy when you really need it. Also works perfectly with no bugs or crashes. Saves you many times when repairing windows systems, when you sometimes find a few surprises either from malware or other software.

There's a vast amount to learn, of course, and that's even before you start building your game. But there's plenty of documentation, tutorials, demos and sample projects to point you in the right direction.

The package is now entirely free, too - no annoying limitations, nag screens or anything else. Epic now only requires that you pay a 5% royalty after the first $3,000 of revenue per product per quarter. And even then, you "pay no royalty for film projects, contracting and consulting projects such as architecture, simulation and visualization."

8.48 brings:
- Optimized grass rendering and procedural foliage system preview
- Plugins available in Marketplace
- Improved accuracy for motion blur
- New Tone Mapper
- Support for all the latest VR hardware including Oculus Rift, Samsung Gear VR, Steam VR and HTC Vive, Leap Motion, and Sony's Project Morpheus for PlayStation 4
- "Scrubbable" network replays with rewind support and live time scrubbing
- Visualize the memory footprint of game assets in an interactive tree map UI